標題: | Widely variable Seebeck coefficient and enhanced thermoelectric power of PEDOT:PSS films by blending thermal decomposable ammonium formate |
作者: | Tsai, Tsung-Che Chang, Hsiu-Cheng Chen, Chun-Hua Whang, Wha-Tzong 材料科學與工程學系 Department of Materials Science and Engineering |
關鍵字: | Thermoelectric;PEDOT:PSS;Ammonium formate;Seebeck coefficient |
公開日期: | 1-十二月-2011 |
摘要: | The doping effects of thermal decomposable ammonium formate (AF) from 5 to 50 wt.% on the electrical conductivity, Seebeck coefficient, and microstructures of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) films have been investigated for the first time for modern thermoelectric applications. It has been found that the Seebeck coefficient can be effectively tuned in a very wide range by varying the AF doping concentration, where a maximum value of 436.3 mu V/K was obtained, i.e., similar to 40 times higher in magnitude than the pure PEDOT:PSS films prepared with same processes. The greatly enhanced Seebeck coefficient is considered to be the result of reducing the carrier concentration, as evidenced by the Hall measurement. In addition, AF also plays an important role in the formation of the closed or open pores and channels within the films for phonon scattering, as can be clearly observed in the SEM images. The present work provides a new procedure to effectively control the Seebeck coefficient as well as the microstructures of PEDOT:PSS polymer by a simple blending approach with suitable thermal steps, which has not previously been reported. (C) 2011 Elsevier B.V. All rights reserved. |
URI: | http://dx.doi.org/10.1016/j.orgel.2011.09.004 http://hdl.handle.net/11536/14928 |
ISSN: | 1566-1199 |
DOI: | 10.1016/j.orgel.2011.09.004 |
期刊: | ORGANIC ELECTRONICS |
Volume: | 12 |
Issue: | 12 |
起始頁: | 2159 |
結束頁: | 2164 |
顯示於類別: | 期刊論文 |